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Power distribution network photovoltaic power generation cluster voltage control method based on distributed Newton method

A voltage control method and distributed photovoltaic technology, applied in the direction of AC network voltage adjustment, circuit devices, AC network circuits, etc., can solve the problems of frequent changes in the gear position of reactive power control equipment, lack of coordination, affecting equipment life, etc.

Pending Publication Date: 2020-08-04
DALI POWER SUPPLY BUREAU YUNNAN POWER GRID
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Problems solved by technology

However, due to the lack of coordination, such methods will cause frequent changes in the gears of reactive power control equipment, thereby affecting the life of the equipment

Method used

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  • Power distribution network photovoltaic power generation cluster voltage control method based on distributed Newton method
  • Power distribution network photovoltaic power generation cluster voltage control method based on distributed Newton method
  • Power distribution network photovoltaic power generation cluster voltage control method based on distributed Newton method

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Embodiment Construction

[0067] The present invention will be further described below in conjunction with the accompanying drawings.

[0068] In the present invention, based on the distributed Newton method, the distribution network photovoltaic power generation cluster voltage control method, once a communication failure occurs, it can effectively deal with the voltage offset only by relying on local information. When the communication does not fail, the specific implementation process is as follows:

[0069] Step 1) From adjacent nodes j∈n i Get the voltage measurement value V i (k). no i Indicates the set of nodes adjacent to node i. Note that in the iterative process, the gradient updates utilize real-time voltage measurements instead of power flow calculations. This feedback iterative mode ensures that the accuracy of the voltage control is not affected by the linearization of the power flow equation and the Newton's direction approximation, which ensures the advantages of the proposed method...

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Abstract

The invention discloses a power distribution network photovoltaic power generation cluster voltage control method based on a distributed Newton method. The method comprises the steps of obtaining a voltage measurement value Vi (k) from an adjacent node j belongs to ni, carrying out the simplified expression and linearization of a reactive voltage optimization control model, and solving a gradientformula of a target function; obtaining a sum gj (k) from adjacent nodes j belonging to ni, and solving an optimization equation of A; calculating a related variable gradient variable quantity of thenode i to calculate an approximate matrix sub-block Ai (k + 1); calculating a descending direction component of a node j calculated by an adjacent descending direction node i of the node i, wherein the descending direction component of the node i calculated by the node j is sent to an adjacent node j belonging to ni and acquired to execute local approximate Newton iteration; and adjusting the photovoltaic inverter , and repeating the process until the difference value of reactive power output by the photovoltaic inverter for two times is smaller than a preset convergence threshold value.

Description

technical field [0001] The present invention relates to a voltage control method, more specifically, to a distribution network photovoltaic power generation cluster voltage control method based on distributed Newton's method. Background technique [0002] As society continues to pay attention to environmental and pollution issues, innovation, transformation and upgrading of modern energy systems have become inevitable. In order to achieve the goal of a clean power system, countries are investing more and more in the research of stable and efficient renewable energy to replace traditional thermal power. As the most potential renewable energy, solar power is becoming an inevitable choice for clean energy transformation. In recent years, my country's distributed photovoltaic power generation is experiencing rapid growth, showing a trend of cluster development, and more and more regional distribution network photovoltaic penetration rates continue to increase. [0003] Due to ...

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Application Information

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IPC IPC(8): H02J3/16
CPCH02J3/16H02J2203/20Y02E40/30Y02E10/56
Inventor 杜文佳
Owner DALI POWER SUPPLY BUREAU YUNNAN POWER GRID
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